Louis baskin



L. BASKIN.

y SPARK PLUG. l

APPLICATION FILED FEB. 28. I9I8.

1 ,312,51 1. V Patented Aug. 12, 1919.

LOUIS BASKIN, OF NEW Y-ORK, N. Y.

SPARK-PLUG.

Specification of Letters Patent.

Patented Aug. 12, 1919.'

Application filed February 28, 1918. Serial No. 219,561.

To all whom it may concern.'

Be it known that I, Louis BAsKiN, a citivvzen of the United States, and resident of New York city, borough of the Bronx, in the county of the Bronx, and State of New York, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specication.

My invention relates to improvements in spark plugs, 'and has particular reference to the construction of what is commonly called one-piece spark plugs wherein the insulating portion having the central electrode is non-detachably secured to the base, one' object of my invention being to enable the construction of the plug with a minimum of loss due to breakage in manufacture, whereby the cost of manufacturing plugs may be reduced. Y

Another object of my invention is to provide a spark plug having a removable central electrode within an insulated tube, with means to detachably retain the electrode within said tube, whereby the electrode may be removed for cleaning and to enable priming of the engine cylinder through the plug.

Otherfeatures of my invention and details of construction will be more fully hereinafter set forth and then pointed out in the claims.

Reference is to be had to the accompanying drawings forming part thereof, wherein,

Figure 1 :is a side view of a spark plug embodying my invention; Fig.- 2 is a longitudinal section on the line 2, 2,y in Fig. 1; Fig. 3 is an enlarged cross section on the line 3, 3, in Fig. 2; Fig. 4 is an enlarged end view of the plug, looking from the bottom of Fig. 1; Fig. 5 is a detail section of thev tube for the central electrode; Fig. 6 is a detail perspective of insulation for said tube; Fig. 7 is an enlarged. detail of the electrode or sparking points for the base; Fig.' 8 is a detail of the central electrode; Fig. 9 is a detail section of the base, illustrating one wayof attaching the electrode 0r sparking points to the base, and Fig. 10 is a detail sectional View illustratingranother wayof attaching said sparking points to the base.

Similar numerals of reference indicate corresponding parts in the several vlews.

The numeral 1 indicates a base of a spark' plug, which may be made of metal in any suitable or well known way, andthe same is shown provided with threads 2 for attachment to an engine. At 3 is a tube upon which ya sleeve 4 is mounted and insulated from the tube. The sleeve 4 may be made of metal yand is shown provided with a downwardly tapering portion 4a adapted to fit gas tight within the correspondingly tapering wall portion 1a of base 1. Tube 3 may be made of metal yand is shown provided with a head or flange 32L at its inner end, and said tube is inclosed within insulation 5. The insulation 5 may be in the form of sheet mica 'wrapped around tube 3 for any number of convolutions. Said insulation with the tube is fitted within sleeve 4. Between the head or flange 3a of tube 3 on one side of sleeve 4 is located insulation 6, which may comprise mica disks, and on the opposite, side of sleeve 4, around tube 3 and insulation 5, is other insulation 7 ,which also may comprise mica disks. The tube 3 isl shown provided with threads 3b at its outer end,

adapted to receivea nut 8 whereby the insulation 6, 7 and the sleeve 4 may be pressed tightly together between head 3"L and nut 8.; The sleeve 4 is shown provided with a recess- 4b receiving some of the mica insulating disks 7, whereby the weight of the sleeve may be reduced. The parts 3, 4, 5, 6, 7 when secured together in the manner stated, providea unit adapted to be secured in base 1, in any desired manner. By preference, the sleeve 4 is secured in base 1 by forcing a portion of the metal of said base against the sleeve. For such purpose I have shown base 1 provided with an integral rim 1b at the inner edge of its bore (Fig. 9), of such dimensions or thickness as will. permit such rim to be rolled, pressed or swagedover against the outer end of sleeve 4, as indicated at 19 in Fig. 2, wherebythe sleeve will be held gas-'tight against the wall lf1L within the base. 4 i

At 9 is a central electrode adapted to pass through the bore in sleeve 3 to coperate -with the s arking point or points, or electrode, carried-.by the base and indicated generally at 10. -The electrode 9 is shown prov correspondingly tapering "portion 3 within a bore of tube 3, adjacent to its outer end, whereby the outer end of electrode 9 may be grasped, and whereby the inner end of said electrode may project suitably beyondrsaid sleeve 1n sultable spaced relation 'to the4 sparking point or points 10. At 11 is a nut having threads adapted to be screwed upon the threads 3h of tube 3 land to jam against nut 8 on said tube. At 12 is a screw meshing in threads in nut 11 and adapted to bear forcibly against "the adjacent end of electrode 9 to retain the latter in tube 3 with its portion 9a firmly seated gas tight against the wall 3* of said tube. The screw 12 may be retained in position by any suitable means, such as by a spring washer or the like 13. vThe nut 11 is shown provided with an annular groove 11EL adapted to receive the connector of an' electric conductor in any suitable manner, although the latter may be connected with the plug in any other desired w-ay.

The spark a ring or dis which may be of nickel or any other desired metal, indicated at 10a adapted to be itted within the lower end of the bore of base 1.- The parts 10, 10a may g be made by Isuitably stamping .sheet metal ing points.

of desired thickness, whereby the electrode 9 may t in roper cooperation to the sparkgVhile Ihave shown a plurality of such sparking points 10 it will be understood that the ring or disk 10a may have one or more such points. The ring or disk 10 may besecuredjto the lbase in any desiredmanner. In Fig. 9 the base yis shown provided with an inner annular recess or groove 14 adapted to receive the ring 10, vwhich may be made in a concavo-convex form to it in the base, as illustrated in Fig. 9. By means of suitable tools the ring and sparking 'points may be flattened while in the base, whereby the ring will expand into said recess 14 (Fig. 2). Or, the lower end of the base may have a rim 11 providing a recess 1 in whichtheY s arking point ring may be set, and then the rim 1d may be rolled or swaged over against ring 10, as indicated in dotted lines in Fig. 10, to retain the ring in the base.

With the constructiondescribed, and the parts assembled as illustrated in Figs. 1 and 2, a plug is provided, so far as the base and insulation for the central electrode is concerned, after the manner of what is commonly called a one-piece plug, and with the detachable electrode 9 fitted thereto.; An advantage of my improvements is that by the` use of metal sleeve 4 the rim 1b of the base may be rolled or pressed'thereon, without danger of breakage of the parts in manu- Eoints are shown provided in] Having now described my invention what I claim is:

1. .A spark plug comprising a base, a metal tube therein insulated from the base, an electrode within the tube, said tube and electrode having coperating inwardly tapering surfaces near the upper end of the tube to make a gas tight fit therebetween, and means to retain said electrode vdetachably in said tube to permit the electrode to be removed outwardly without removing the plug from an engine cylinder permitting priming of the engine through the tube.

2. 4A spark plug comprising a base, a metal tube therein insulated from the base, an electrode within the tube, said tube and electrode having coperating inwardly tapering surfaces to make a gas tight fit therebetween, a

permit the electrode to be removed outwardly without removing the plug from an engine cylinder permitting priming of the engine through the tube.

3. A spark plug comprising a base having an inner inwardly tapering wall, a sleeve within the base having an outer correspond` -ingly tapering. wall coperative with the rst named wall, vmeans to secure said base and sleeve together with said walls coperatj ing gas-tight, a tubewithin thesleevev projecting within the base, insiilation wrapped 'around .the tube within the sleeve,J

insulation upon the tube on op vosite sides of the sleeve, and means to retaln the sleeve upon the tube between the last named insulation, an electrode within thetube having its inner end projecting beyond the tube into cooperative relation to a sparking point on the base, and means to retain the electrode in the'tube.

4:. A spark plug comprising a base having an inner inwardly tapering, Wall, a sleeve within the base having an outer oorrespondingly tapering wallcooperative with the first named wall, means to secure said base and sleeve together with said walls coperating gas-tight, a tube within the sleeve projecting within the base, insulation wrapped around the tube within the sleeve, and means to retain the sleeve upon the tube between the` last named insulation, an electrode within the tube having its inner end projecting beyond the tube into coperativev relation to a sparking point on the base, and means to removed outwardly without removing the plug l tain the electrode in the tube, said electrode from an engine cylinder permitting priming having an outer inwardly tapering portion of the engine through the tube. 10 and said tube having an inner inwardly Signed at New York city, in the count 5 tapering portion coperating therewith, and of New York and State of New York, this means to detaehably retain the electrode in 27th day of February A. D. 1918. said tube to permit the electrode to be re- LOUIS BASKIN. 

